Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Question Explanation:

The question asks to identify which of the chemical structures represents the Z geometric isomer based on the spatial arrangement of high-priority groups around a double bond.

Concept : This question is based on Geometrical Isomerism, E-Z Nomenclature.

Solution:

To determine the configuration, we assign priorities (1 for higher, 2 for lower) to the two atoms/groups attached to each carbon of the double bond based on their atomic numbers:

Option 1: On the left, Me (C) > H. On the right, Et (C) > D. High-priority groups are on opposite sides

(E).

Option 2: On the left, Me (C) > H. On the right, Ph (C) > CH₃ (C). High-priority groups are on opposite sides (E).

Option 3: * Left Carbon: Cl (Atomic No. 17) is higher priority than Me (C, Atomic No. 6). Priority 1 is

at the bottom.

Right Carbon: Cl (Atomic No. 17) is higher priority than CN (C, Atomic No. 6). Priority 1 is at

the bottom.

Since both priority 1 groups are on the same side, it is the Z form.

Option 4: On the left, Cl > CH₃ . On the right, Br > Cl. High-priority groups are on opposite sides (E).

Final answer: Option (C)